Printing from Terminal Services Session

I am using Windows XP remote desktop client to access
terminal services on a Windows 2000 SP4 server. When I
initially log on I can print without a problem. However,
if I minimize my my RDP connection and connect to a USB
device (digital camera) I am unable to print upon
returning to the remote desktop. However, if I disconnect
the session and reconnect then printing will resume. The
printer is an HP Deskjet 5650 using the parallel interface.